Citrus trifoliata, Poncirus trifoliata

USDA Plant Hardiness Zone Map

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This is the hardiest close relative of Citrus. It is a deciduous shrub armed with vicious spines and will survive temperatures as low as 0F to -10F. In the USA it certainly grows as far north as Boston, MA (Hardy for zones 5-9). The fruits are like small oranges about 1.5 inches across, very sour, but can be used in conserves and drinks. Watch it through the seasons. In spring it sports white, fragrant flowers. Its summer foliage is shiny and dark green. In autumn it sheds its leaves to show off its glossy-green stems. Fruit, which is very sour, also adds fall interest. It is a great barrier plant and can be trimmed to form a 3-foot hedge. It can also be used as a novelty specimen. It is also used as citrus rootstock.

Similar plants:

• Citrus aurantifolia (Mexican Lime, Key lime, West Indian lime)
• Citrus australasica, Microcitrus australasica (Finger Lime, Caviar Lime)
• Citrus australis (Australian Lime)
• Citrus bergamia (Bergamot orange)
• Citrus grandis, Citrus maxima (Pomelo, Pommelo, Pummelo)
• Citrus hystrix (Indonesian lime, Wild lime, Kaffir Lime)
• Citrus junos (Yuzu)
• Citrus limetta (Sweet Lime, Sweet Lemon)
• Citrus limettioides (Indian Sweet Lime, Palestinian Lime, Lima Dulce, Pinata Lime)
• Citrus limon (Lemon)